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Pension and Other Retiree Benefits (Other Changes Recognized in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial loss (gain) | $ 10.6 | $ 15.0 | $ 12.0
Amortization of actuarial (loss) gain | (3.2) | (2.2) | (2.7)
Current year prior service cost | 0.0 | 0.0 | 0.0
Amortization of prior service (cost) credit | (0.4) | (0.4) | (0.4)
Foreign exchange rate changes | 0.0 | 0.0 | 0.0
Total recognized in other comprehensive income (loss) | 7.0 | 12.4 | 8.9
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) | 6.7 | 12.0 | 8.5
Pension | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial loss (gain) | 36.5 | 43.3 | 5.3
Amortization of actuarial (loss) gain | (5.3) | (3.3) | (3.4)
Current year prior service cost | 0.0 | 0.0 | 6.5
Amortization of prior service (cost) credit | (0.3) | (0.3) | 0.3
Foreign exchange rate changes | 8.5 | 3.4 | (7.1)
Total recognized in other comprehensive income (loss) | 39.4 | 43.1 | 1.6
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) | 37.6 | 41.0 | (3.5)
Post-retirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial loss (gain) | 0.0 | (1.0) | (0.3)
Amortization of actuarial (loss) gain | 0.5 | 0.4 | 0.4
Current year prior service cost | 0.0 | 0.0 | 0.0
Amortization of prior service (cost) credit | 0.0 | 0.0 | 0.1
Foreign exchange rate changes | 0.0 | 0.0 | 0.1
Total recognized in other comprehensive income (loss) | 0.5 | (0.6) | 0.3
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) | $ 0.1 | $ (0.8) | $ 0.1

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